Abstract
Field excitation flux switching machines (FEFSMs) in which their torque performance produced by interaction between armature and field excitation (FE) coils have been widely designed for various applications. In this regard, three-phase salient rotor FEFSM with overlap windings is considered the most suitable candidate for high speed applications because of their advantages of flux controllability, and robust due to single piece of rotor structure. However, the overlap windings cause a high copper loss, hence efficiency of the motor becomes low and higher stack length. Besides, the salient rotor structure is found to produce low torque performance due to the longer flux path in stator and rotor yielding weak flux linkage. In this paper, a new single-phase FEFSM using non-overlap windings between armature coils and FE coils is proposed. Both non-overlap windings FEFSMs with salient and segmental rotors have been designed using JMAG Designer version 15 and the investigation process is conducted via 2D finite element analysis. The proposed motor performances verification has been done by comparing the results of flux linkage, flux line and distribution, flux strengthening, various torque capability, and torque-power versus speed characteristics. As a conclusion, single-phase non-overlap windings FEFSM using segmental rotor with power, torque and speed capabilities of 277.5 W, 0.91 Nm and 2,899 rpm, respectively considered as the best candidate for low torque high speed applications.
Highlights
Most of the commercial applications that require low torque and high speed performances such as blower, exhaust fan, compressor motors, pumps, and fan are using induction motors (IMs) as their main prime mover [1], [2]
The example of structure and specifications of single-phase IMs used in commercial applications are illustrated in Figure 1 and Table 1, respectively [3]
The performances comparison between salient and segmental rotors is made based on the results of flux linkage, flux distribution, flux line, flux strengthening, back-emf, various torque capability, and torque-power versus speed characteristics
Summary
Most of the commercial applications that require low torque and high speed performances such as blower, exhaust fan, compressor motors, pumps, and fan are using induction motors (IMs) as their main prime mover [1], [2]. The motor with overlap windings has high average torque and power performances due to high winding inductance and high flux linkage [15] Despite of their have merits of high winding inductance, cost saving, magnet-less machine, and variable flux control capabilities reasonable for various commercial applications, the single-phase FEFSMs structure and winding technique can further be enhanced to improve their torque performance and efficiency. In these regards, a new structure of non-overlap windings singlephase FEFSM using salient rotor (SalRoN) and segmental rotor (SegRoN) are proposed. The proposed motors have 12 slots for copper windings, and 6 rotor poles. 2D finite element analysis (FEA) through JMAG Designer version 15 is used to analyse the flux linkage, flux distribution, flux line, flux strengthening, backemf, torque capability, and torque-power versus speed characteristics of the proposed motor
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